🟢 argenx is trading 28.12% up in after-hours trading with no confirmed catalyst

argenx is trading at $1049.46, up 28.12% in after-hours, with the cause unconfirmed.

• No verified October 16 company announcement or late-breaking catalyst surfaced; the newsroom lists October 22 third-quarter results and a business update.
• Search results report a regular-session close of $819.14 and little after-hours change, conflicting with the supplied quote; the supplied price context is used.
• The broad-market decline does not explain the opposite-direction move.